Device for regulating the rotary motion of a shaft.



PATENTED AUG. 11, 1908. s. H. LEAVENWORTH & J. W. FARRELL. DEVICE 011REGULATING THE ROTARY MOTION OF A- SHAFT.

APPLICATION FILED APR. 6, 1907.

' UNITED sTA' Es PATENT oEEIcE.

SETH H. LEAVENWORTH AND JAMES W. FARRELL, OF CINCINNATI, OHIO, ASSIGNORSTO HOMAN & COMPANY, OF CINCINNATI, OHIO.

DEVICE FOR REGULATING- THE ROTARY MOTION OF A SHAFT.

To all whom it may concern:

Be it known that we, SETH H. LEAVEN- WORTH and JAMES W. FARRELL,citizens of the United States, residing at Cincinnati, in the county ofHamilton and State of Ohio, have invented new and useful Improvements ina Device for Regulating the Rotary Motion of a Shaft, of which thefollowing is a specification.

Our invention relates to a device for governing the rotary motion of ashaft, and the objects of our invention are: First, to stopautomatically, and after a predetermined number of turns, the rotarymotion of a shaft. Second, to provide a resistance that will retard therotation of a shaft.

This invention applies primarily to a shaft that is actuated by manualpower, but can be used also 011 a shaft actuated by mechan ical power.IVe attain these objects by the mechanism illustrated in' theaccompanying drawings.

This invention applies particularly to candle molding machines. A candlemolding machine consists of vertically arranged tubes, set in an ironbox mounted on legs. Into these tubes operate plungers by which thecandles are ejected. The plungers rest upon a common follower which israised by vertical racks engaging with a train of gears.

This train of gears is operated by a shaft, and upon this shaft themechanism covered by this specification is fixed. The safety brakeprevents the follower upon which the ends of the plungers rest, fromfalling at such a rate of speed as to break the machine after thecandles have been ejected from the tubes,

and the follower is being let down. The rack and nut can be so set as tostop the follower at any desired point. This causes the heads of theplungers to stand at a corresponding point in the tubes, enabling theoperator of the machine to cast candles shorter than the full length ofthe tubes.

Similar letters refer to similar throughout the several views.

Figure 1. is a plan view of the mechanism. Fig. 2. is a section on AA.Fig. 3. is a section on the line B'B.

a represents a shaft, the rotary motion of which it is desired toregulate.

b is a drum secured on the shaft (1. c is a pinion also secured on theshaft on by means of the key cl.

parts Specification of Letters Patent.

Application filed April 6, 1907.

Patented Aug. 11, 1908.

Serial No. 366,864.

e is a brake band, carrying friction material, encompassing the drum 6,and adjustable by means of the screws 1.

f is a ratchet wheel, engaging with the brake band 6 by means of thelugs g g, and free to rotate on the collar of the pinion c.

h is a pawl, pivoted on a housing and sup port k, engaging with theratchet wheel f.

m is a rack with a screw extension n, carrying adjustable and lock nuts0 and p.

q is an extension of the housing j, which serves as a guide for the rackm, and the extremity acts as a stop with which the adjustable nut 0contacts after a predetermined amount of travel.

r, 1', etc., are blocks of flexible friction material riveted to thebrake band e.

When the shaft (1 is rotated, the pawl h engages with the ratchet wheelf, causing the drum 1) to turn within the brake band 6. resistance,adjustable by the amount of tension of the brake band, is thus providedagainst the motion of the shaft. The adjustable nut 0 and the lock nut pare set at any desired point on the screw extension n of the rack m, andby contact with the stop (1 check the motion of the shaft a after apredetermined number of rotations.

Having described our invention, we claim:

1. In a device of the kind described, the combination of a shaftya drumsecured to the shaft; a brake band encompassing said drum; a pawl; aratchet wheel engaging with the brake band and free to rotate with theshaft in one direction, but prevented from rotation in the oppositedirection by said pawl and a pinion secured to the said shaft a rackhaving a screw extension engaging said pinion; a stationary stop; a nutadapted to be moved up and down upon'said extension, and to come intocontact with said stationary stop, all substantially as specified.

2. In a device of the kind described, the combination of a shaft; a drumsecured to the shaft; a brake band encompassing said drum; a pawl; aratchet wheel engaging with brake band by means of lugs which enter intorecesses in the brake band, said brake band being free to rotate withthe shaft in one direction, but prevented from rotation in the oppositedirection by said pawl and a pinion secured to the said shaft; a rackhaving a screw extension engaging said pinion; a

stationary stop; a nut adapted to be moved I up and down upon saidextension, and to come into contact with said stationary stop, allsubstantially as specified.

3. In a device of the kind described, the combination of a shaft; a drumsecured to the shaft; a brake band encompassing said drum, the brakeband composed of two semicircular parts capable of being contracted orexpanded by means of lugs carrying adjusting screws by which the tensionof the brake band may be regulated; a pawl; a ratchet wheel engagingwith the brake band by means of lugs entering into recesses in the brakeband, said ratchet wheel being free to rotate with the shaft in onedirection, but prevented from rotation in the opposite direction by saidpawl; and a pinion secured to the said shaft; a rack having a screwextension engaging said pinion; a stationary stop; a nut adapted to bemoved up and downupon said extension, and to come into contact with saidstationary stop, all substantially as specified.

4. In a device of the kind described, the combination of a shaft; a drumsecured to the shaft; a brakeband encompassing the said drum, the brakeband being composed of two semi circular parts capable of beingcontracted or expanded by means of lugs carrying adjusting screws bywhich the tension of the brake band may be regulated, the

brake band being fitted with insertions of friction material atintervals, constituting the friction surface contacting with the abovementioned drum; a pawl; a ratchet wheel engaging with the brake band,being free to rotate with the shaft in one direction, but prevented fromrotation in the opposite direction by said pawl; and a pinion secured tothe said shaft; a'rack having a screw extension engaging said pinion; astationary stop; a nut adapted to be moved up and down on saidextension, and to come into contact With said stationary stop, allsubstantially as specified.

5. In a device of the kind described, the

combination of a shaft; a drum secured to the shaft; a brake bandencompassingthe said drum; a pawl; a ratchet wheel engaging with thebrake band, and free to rotate with the shaft in one direction, butprevented from rotation in the opposite direction by said pawl; and apinion secured to the said shaft; a rack having ascrew extensionengaging said pinion; a stationary stop; a nut adapted to be moved upand down on said extension, and to come into contact with saidstationary stop; a housing so constructed as to form a guide to confinethe rack to a motion tangent to the circumference of the pinion, allsubstantially as specified.

6. In a device of the kind described, the combination of a shaft; a drumsecured to the shaft; a brake band encompassing the said drum; a pawl; aratchet wheel engaging with the brake band, and free to rotate with theshaft in one direction, but prevented from rotation in the oppositedirection by said pawl; and a pinion secured to the said shaft; a rackhaving a screw extension engaging said pinion; a stationary stop; a nutadapted to be moved up and down on said extension, and to come intocontact with the said stationary stop; a housing so constructed as toform a guide to confine the rack to a motion tangent to thecircumference of the pinion; the said guide being provided with ashoulder constituting a stop, with which the adjusting nut on the screwextension of the rack contacts after the shaft has made a predeterminednumber of turns, all substantially a specified.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

SETH H. LEAVENWORTH. JAMES W. FARRELL.

Witnesses:

THOMAS A. MAOKLIN, JOHN A. HOSTY.

